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Assignment 3 – User-Defined Functions/Recursion/ Arrays

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COEN243
Assignment 3 – User-Defined Functions/Recursion/ Arrays
Deadline: Monday July 24 at 23:59 PM EDT
Type: Group Assignment
Weight: 5%
Submission instructions:
– Create a cpp file for each question
– Compress the files using zip or other tools
– Submit the zip file on Moodle
– Please do not submit exe files
– All submissions must be done through Moodle
Marking Scheme:
– Program correctness (90%)
– Program clarity (output format, comments, completeness, readability) (10%)
Q1. (25 marks): Write a C++ program that uses an array to store the grades of N students (N is
entered by the user), and outputs the information below. Your program should be structured
using functions. Each functionality should be implemented in a separate function.
1- 4 highest grades
2- 4 lowest grades
3- Average grade
4- Median grade
5- Number of A grades (grades equal or more than 90)
6- Number of B grades (grades between 80 (inclusive) and 90)
7- Number of C grades (grades between 65 (inclusive) and 80)
8- Number of D grades (grades between 50 (inclusive) and 65)
9- Number of F grades (grades less than 50)
Q2. (25 marks) A Palindrome is a string that is spelled the same way forward and backward.
Examples of palindromes include “radar” and “able was I ere I saw elba”. Write a recursive
function testPalindrome that returns true if a string is palindrome, and false otherwise. Note that
like an array, the square brackets ([]) operator (index) can be used to iterate through the
characters in a string.
Q3.(50marks):We want to create a program that controls the movements of a robot in an array
of size Initially, the robot is at position 0. The controller supports the following commands:
• right (n): the robot moves n cells right
• left (n): the object moves n cells left
• reboot: the object comes back to cell 0
COEN 243 – Summer 2021
2/2
Consider the following example:
^
0 1 2 3 4 5 6 7 8 9
The new array after executing the command right (5) will look like this:
^
0 1 2 3 4 5 6 7 8 9
The new array after executing the command left (3) will look like this:
^
0 1 2 3 4 5 6 7 8 9
The program takes commands from a user as shown in the following example:
Controller Menu:
1. Right
2. Left
3. Display
4. Reboot
5. Show Array
6. Exit
Command “Display” display the position of the robot in the array. Command “Show Grid” displays
the array.Command “Exit” terminatesthe program.
‐ Implement the controller’s commands using functions. Add the necessarily checks to
ensure thattherobotdoesnotgooutofbounds. Yourprogramshouldbestructuredusing
functions. For example, each command should be implemented in a separate function.
(30marks)
‐ Wewantto add the following commands(20marks):
o cancel (n): The program cancels the last n operations and returns the robot to the
initial position
o replay(n):Theprogramreplaysthelastnoperationsthathavebeencancelled.

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